1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_CURRENT_H
3#define _ASM_X86_CURRENT_H
4
5#include <linux/compiler.h>
6
7#ifndef __ASSEMBLY__
8
9#include <linux/cache.h>
10#include <asm/percpu.h>
11
12struct task_struct;
13
14struct pcpu_hot {
15	union {
16		struct {
17			struct task_struct	*current_task;
18			int			preempt_count;
19			int			cpu_number;
20#ifdef CONFIG_CALL_DEPTH_TRACKING
21			u64			call_depth;
22#endif
23			unsigned long		top_of_stack;
24			void			*hardirq_stack_ptr;
25			u16			softirq_pending;
26#ifdef CONFIG_X86_64
27			bool			hardirq_stack_inuse;
28#else
29			void			*softirq_stack_ptr;
30#endif
31		};
32		u8	pad[64];
33	};
34};
35static_assert(sizeof(struct pcpu_hot) == 64);
36
37DECLARE_PER_CPU_ALIGNED(struct pcpu_hot, pcpu_hot);
38
39static __always_inline struct task_struct *get_current(void)
40{
41	return this_cpu_read_stable(pcpu_hot.current_task);
42}
43
44#define current get_current()
45
46#endif /* __ASSEMBLY__ */
47
48#endif /* _ASM_X86_CURRENT_H */
49